In Psychology
In 1988, Marques, Yzerbyt and Leyens conducted an experiment where Belgian students rated the following groups according to trait-descriptors (e.g. sociable, polite, violent, cold): unlikeable Belgian students, unlikeable North African students, likeable Belgian students, and likeable North African students. The results provided support that the favorability is the highest for likeable ingroup members and the lowest for unlikeable ingroup members, whereas the favorability of unlikeable and likeable outgroup members is between the both former ones. These extreme judgements of likeable and unlikeable (i.e., deviant) ingroup members, relatively to comparable outgroup members is called "black sheep effect". This effect has been shown in various intergroup contexts and under a variety of conditions, and in many experiments manipulating likeability and norm deviance.
Read more about this topic: Black Sheep
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